(loe: ekou)

olemus
tagasipeegeldus või tagasisaatmine
= reflection of waves or return of data

(1a) akustiline: heli või ultraheli tagasipeegeldus
Merriam-Webster:
1a: the repetition of a sound caused by reflection of sound waves
1b: the sound due to such reflection
https://en.wikipedia.org/wiki/Echo

(1b) elektriline: signaali tagasipeegeldus
Merriam-Webster:
5a: the repetition of a received radio signal due especially to reflection of part of the wave from an ionized layer of the atmosphere
5b(1): the reflection of transmitted radar signals by an object
5b(2): the visual indication of this reflection on a radarscope
https://en.wikipedia.org/wiki/Signal_reflection

(1b) andmesides: saadetud andmete tagasisaatmine
= repeating data back to the sender
https://en.wikipedia.org/wiki/Echo_(computing)

näiteid
anechoic -- kajatu, heli summutav
echo back -- kajama, kajana kordama
echo signal -- kajasignaal
echoless -- kajatu, sumbuv
radar echo -- radaripeegeldus

vt ka
- ICMP kajanõue
- kajakäsk, echo-käsk
- kajalood
- maailmakaja